Doorlatch



G. L- HINMAN DOORLA'IYCH Filed Dec. 15. 1927 May 12,1931.

2 Sheets-Sheet 1 G. L. HINMAN May 12, 1931.

DOORLATGH Filed Dec 15. 1927 2 Shasta-Sheet 2 Patented May 12, 1931"UNITED STATES PATENT OFFICE GEORGE L. HINMAN, OF NEW HAVEN,CONNECTICUT, ASSIGNOR TO THE GREIST MANU- FACTURING (30.; OF NEW HAVEN,CONNECTICUT, A CORPORATION DOORLATCH Application filed December 15,1927. Serial No. 240,181.

My invention relates to an improved door latch of the type having aninside and an outside handle in which "the retraction of the latch-boltby the outside handle may be at any time forestalled by asupplementalmovement of the inside handle in the reverse direction fromthat required for retractin'g the latch-bolt thereby, the object beingto produce, at a low cost for manufacture, such a latch constructed withparticular reference to simplicity, fewness of parts, ruggedness,reliabliity, and convenience of use. My improved latch, while designedwith particular reference for use onthe doors of. automobiles, is not solimited. a

With these'ends in view, my invention consists in a door latchcharacterized by having a reciprocating latch-bolt, inside and outsidehandles, inside and outside rollbacks respectivel connected with thesaid handles, and a locking-finger carried by the inside roll-back andmovable by a su lementary reverse movement of the inside andle into thepath of movement of the outside roll-back for preventin the retractionof the bolt by the said outslde handle.

- My invention further consists in a latchbolt characterized as aboveand having cer- 3otain details of construction and combinations 'ofparts as will be hereinafter described and'particularly pointed out inthe claims.

In the accompanying drawings:

Fig. 1 is a top edge view of a remote control latch-bolt mechanismembodying my invention;

Fig. 2 is a view thereof in elevation, looking from the outside of thedoor;

Fig.. 3 is a detached perspective view of the inside roll-back thereof;a

Fig. 4 is a corresponding view of the outside roll-back; i Fig. 5 isatop. edge view of a self-contained form of latch-bolt which myinvention may' assume, in this form the outside handle being installedin the same frameplate as the inside handle; Fig. 6'-isa view inelevation, looking from the outside of the door with the retainingplateorcover removed; and

Fig. 7 is a detached perspective view of the inside roll-back thereof.

In carrying out my invention, as shown in Figs. 1 to 4 inclusive, it isembodied in a latch-bolt of the so-called remote-control type, by whichis meant a latch-structure in which the inside handle is located at aconsiderable distance from the edge of the door in which the latch-boltitself is installed, for greater convenience in operating the latch fromthe inside of a car. This latch in question is provided with an-insideleverhandle 10 and an outside lever-handle 11, either one of which isadapted to effect the retraction of a heavy sheet-metal latch-bolt 12having a beveled nose 13 secured to it by rivets 14. The isaid nose .13projects through an opening 15 in a flange 16 turned outward at a rightangle from a rectangular frame-plate 17 The inner end of the latchbolt12 is guided by a roller 18 turning on a stud 19 projecting outwardlyfrom the said frame-plate 17 the bolt being provided with aclearance-slot 20 into which the roller 18 projects and upon the wallsof which it .rides. The bolt is normally retained in its projectedpositionby a spiral spring 21, the outer end of which engageswith theheel 22 of the bolt, while its inner end is secured to a post 23oflstanding from the plate 17.

The bolt is held in place by means of a re- Y tainingsplate' 24 securedin spaced relation which is formed with a perforation 30 by which it ismounted upon a stud 31 in the plate 17 The said roll-back is formed withan upstanding-arm 32 pivotally connected by a rivet 33 with the outerend of a long. horizontally-arranged link 34, the inner end of which ispivotally connected by a rivet 35 with the upper end of an arm 36carried by the spindle 37 of the inside lever-handle 10, the saidspindle being installed in a back 43.

handle mounting-plate 38 provided with screw-holes 39 for fastening itto the inside of a car door. The said plate 38 is furnished with. aretaining-plate or cover 40 which holds the upstanding-arm 36 in placeupon the spindle 37.

For the retraction of the latch-bolt 12 from the outside of the door,the spindle 41 of the outside handle 11 is entered into the squaredopening 42 of an inside roll-back 43, the inner edge of which co-actsfor retracting the latch-bolt, with a curved finger 44 upstandingtherefrom and integral therewith.

It is clear from the foregoin description that the latch-bolt 12 may eretracted a ainst the tension of its s ring 21 by a suita le movement ofeither t e outside handle 10 or the inside handle 11.

To enable the latch-bolt to be locked when desired against retraction bythe outside handle, the inside roll-back 29 is provided with an integraloffsettingblocking-finger 45 having ablocking-face 46 co-acting, underpredetermined conditions, with a blocking-face 47 formed upon acomplementary blocking-finger 48 projecting inwardly from the upper endof the outside roll- In the ordina operation of the latchbolt by itsinsi e or outside handle, the blocking-fingers 45 and 48 turn with theirrespective roll-backs, with which they are integral, without ever beingbrought into collision, since, normally, both of the rollbacks areturned inwardly away from the edge of the door. Thus, for the retractionof the bolt from the outside of the door, the

handle 11 is swung downwardly, with the effect of turning the roll-back43inwardly, away from the edge 'of the door, against the upstandin bowedarm 44 of the latch-bolt, which is t us retracted; while to eflect theretraction of the latch-bolt from the inside of the door, the insidehandle 10 is swung rearwardly away from the edge of the door in thedirection of the arrow a in Fig. 2, whereby the arm 36 carried by thesplndle 37 exerts a thrust on the link 34, moving the same outwardtoward the edge o the door and correspondingly rocking the arm '32 ofthe inside roll-back 29, the cam-surface 28 of which moves rearward aainst the upstanding arm 27 of the late -bolt and retracts the same.

The blocking-fingers 45 and 48 are so positioned that, during the twooperations above described, they are not brought into collision.However, in-case the user of the car desires, on leaving it, to preventthe door from being opened from the outside, he may forestall this by asupplementary reverse movement of the inside handle 10. When this handleis swung outwardly toward the edge of the door in the direction of thearrow I) (Fig. 2) into the'position in which it is shown by broken linesin the said figure, the blocking-finger 45 of the inside roll-back islifted into the path of movement of the blocking-finger 48 of theoutside roll-back 43, as also shown in Fig. 2; the stop 49 on the finger45 checking the upward swing of the latter. The parts now occup% thepositions shown by broken lines in ig. 2. It will be noted, in the saidfigure, that the said blocking-fingers are engaged above the line 0drawn between the centers about which the respective roll-backs turn.Now, when I an effort is made to turn the outside r0ll-' back bydepressing the outside handle, a jam takes place and effectuallyprevents such traction of the bolt, from the outside of the car, thedoor of which is thus eflectually locked. To restore the latch to whatmaybe termed its status quo, it is only necessary to swing its insidehandle 10, as shown by broken lines in Fig. 2, to the. position in whichit is shown in full lines in the same figure, whereby theblocking-finger 45 of the inside roll-back is moved .out of the path ofmovement of the blocking-finger 48 of the outside roll-back leavin thelatter free to efiect the retraction of t e bolt.

The inside roll-back 29 is maintained in its normal position, as shownby full lines in Fig. 2, or in its supplementary or blocking position,as shown by broken lines in the same figure, by means or" adetent-spring 50 having dwells 51 and 52 for the reception of a nose 53formed upon the inner edge of the roll-back.

In the self-contained form of my improved door latch shown by Figs. 5, 6and 7 of the drawings, the several arts are the same as alreadydescribed, wit the spindle 37 is also mounted in the framepl'ate 17,thus dispensing with the secondary plate 38, the arm 36, the link 34,and the arm 32 of the roll-back 29, which latter assumes the form shownin Fig. 7. Both spindies and handles and their related parts are thusorganized on the frame-plate, the only substantial difierence being thatthe latch now being described does not provide for what is known asremote control. The operation of the latch under consideration is thesame in every respect as the latch first mentioned.

I claim: I

1. A door latch, having a reciprocating latch-bolt; inside and outsidehandles; 'inside and outside roll-backs respectivel connected with thesaid handles; and a locking-finger carried by the inside roll-back andmovable by a supplementary reverse movement of the inside handle intothe'path turning movement and, therefore, the -rethe exception that v ofmovement of the outside roll-back for preventin the retraction of thebeing adapted to 2. A door latch, having a reciprocating latch-bolt;inside and outside handles; inside and outside roll-backs respectivelyconnected with the said handles; and blockingfingers carried by therespective roll-backs, the blocking-finger of the inside roll-back bebrought, by a supplementary reverse movement of the inside handle, intothe path of movement of the blocking-finger of the outside roll-back forpreventing the retraction of the bolt by the outside handl'e.

3. A door latch, having a reciprocating latch-bolt; inside and outsidehandles; in-

sideand outside roll-backs respectively connected with the said handle;a blockingfinger carried by the inside roll-back and movable by asupplementary reverse movement of the inside handle into the path ofmovement of the outside roll-back for preventing the retraction of thebolt by the outside handle; and a stop formed upon the blocking-fingerof the inside roll-back to engage with the outside roll-back to arrestits movement when it reaches its blocking position. In testimonywhereof, I have signed this specification.

GEORGE L. HIN AN.

